The Pennsylvania Department of Environmental Protection has released the findings of a third study showing no emissions levels that would be of public concern: "'The results show there are no emission levels that would be of concern to the health of residents living and working near these operations,' DEP Secretary Mike Krancer said. 'They are consistent with the results of our air monitoring in southwest and northeast Pennsylvania, the other two areas of the state with the most Marcellus drilling.'" (News Release.)
For a copy of the study, see here.